package main

import (
	"flag"
	"fmt"
	"sort"

	"github.com/gorilla/securecookie"
)

var (
	fs = flag.NewFlagSet("gistea", flag.ExitOnError)

	// Optional
	_                 = fs.String("config", "", "Config file")
	jsonFlag          = fs.Bool("json", false, "Enable JSON logging")
	portFlag          = fs.Int("port", 8080, "Port to run on")
	sessionSecretFlag = fs.String("session-secret", string(securecookie.GenerateRandomKey(32)), "Session secret")

	// Required
	domainFlag            = fs.String("domain", "", "Domain Invitea is running on")
	giteaURLFlag          = fs.String("gitea.url", "", "Gitea URL")
	giteaClientKeyFlag    = fs.String("gitea.client-key", "", "Gitea OAuth2 Client Key")
	giteaClientSecretFlag = fs.String("gitea.client-secret", "", "Gitea OAuth2 Client Secret")
)

func requiredFlags() error {
	required := map[string]*string{
		"domain":              domainFlag,
		"gitea.url":           giteaURLFlag,
		"gitea.client-key":    giteaClientKeyFlag,
		"gitea.client-secret": giteaClientSecretFlag,
	}

	var unset []string
	for k, v := range required {
		if *v == "" {
			unset = append(unset, k)
		}
	}
	if len(unset) > 0 {
		sort.Strings(unset)
		return fmt.Errorf("the following flags were unset, but are required: %v", unset)
	}

	return nil
}